Improved machine for dressing stone



l UNTTE'C STATES ATENE Error..."

IMPROVED MACHINE FOR DRESSINGSTONE.

Specification forming part of Letters Patent No. 79,838. dated July 14,ISGS.

To a/ZZ whom t may concern:

Be it known that I, FRANCIS L. KING, of

the city and county of Vorcester, and State Fig. 2 is a Fig. 3 is a planof the Fig-4 is an end elevation.

Fig. 5 is a top View ofthe grinder-box. Fig. .6 `is a bottom view of thescroll-grinder. Fig. 7

is a sectional view of the same. Fig. 8 is a side elevation of thegrinder-box. Fig. 9 is a top view of the scroll-grinder. Fig. 10 is abottom view ofthe grinder-box, showing the manner of adjusting stone inthe saine. Fig. l1 is a plan of the self-adjusting frame.

My invention consists of an improved arrangement for adjusting the stoneto be dressed, so as to hold them steadily and securely in the samerelative position, thus insuring a perfectly plane surface also, animproved method of supplying sand and Water,- a peculiar-shapedscroll-grinder, a peculiarlyarranged self-adjusting frame and manner ofv raising and lowering the same at will, and an arrangement forrelieving the grinders of all surplus weight not necessary as agrindingpower.

To enable others skilled in the art to mak and use my invention, I willdescribe its con struction andoperation by referring to. the drawingsannexed;

The frame of my machine may be constructed of any suitable material, theform being so arranged as to furnish the necessary strength and bearingsof the different parts.` In avertical position, extending from the upperto the lower portion of the frame, is the main driving-shaft A, carryingat the upper end the master-wheel B, which gears into gears G C. Onthe'vertical lgrinder-shafts D D, hereinaftermore fully explained, theshaft A, at the lower Yend, carries the small gear E, (shown on Fig. 4,)which meshes into the gear F, which, by means of the standards G G andarm H, (shown on Fig. 4,) give tlie reciprocating motion to the carriageI. The same motion may be imparted by suitablyarranged gears and ashipper, or by suitablyarranged friction-pulleys, according toconvenience or size of machine. The grindershafts D D are supportedin avertical position in the stationary bars K K (best shown in Fig. 4t) bysuitable bearings in the selfadjusting frame L. (Best shown in Fig. Il.)The gears C C are furnished with a set-screw or feather, which slides ina slot cut lengthwise in the grinder-shafts D D, thus :allowing thegrinder-shafts freely to slide up or down, while the gears G G, bymeansof the setscrew or feather, imparts a rotary motion.

The grinder-shafts D D are made hollow. AtV

the upper end are attached the hoppers M M, through which sand andwaterare conveyed to the grinding-surfaces. At the llower end of thegrinder-shafts D D are attached, in suitable manner, the grinder-boxes NN, which are fully shown in Figs. 5, S, l0. On the grinder-shafts, justabove the self-adjusting frame, the collars O O are securedV in asuitable manner for the purpose of raising said shafts, and theaforesaid grinders, as the selfadjusting frame raises or lowers, alsofor the purpose of holding both grinders directly in line, preventingeither one of the grinders from dropping down faster than the other,

thus securing perfect Work, even when theV stone at one end of themachine is much softer than at the other. The self-adjusting frame L ismade of any suitable material, andmfurnishes bearings for thegrinder-shafts at the point d c', which, in connection with the'slidingbearings b b, which slide against the rack -P P,` prevent any vibrationof the grindershafts. At each end of the shafts R It, which pass throughthe arms of the self-adjusting frame L, are firmly attached thespur-gears S S and bevel-gears 'I T, the bevel-gears in each cornergearing into each other, and the spur-gears mesh intothe racks I l?,which are firmly attached to the corner-posts of the machine. By thisarrangement the selfadjusting frame retains its perfect level, and runsfreely up or down, even when the weight to be sustained' is much greaterat one end than at the other, and thereby securing perfect work byholding both grinders perfectly level. The grinding -boXes N N are forthe purpose of holding the upper stones, and should be made of iron togive-strength, and are ad justable, by means of set-screw ci, or itsequiv when one is much thicker than the other.

clogging. As the grinder rotates, both the sand alent,to the lower endof the grinder-shafts D D, by which a rotary motion is imparted.

For convenience in handling and adjusting the stone, the same is made insections, the sides being'attached to the top by bolts. On the side thestrong knobs d dlare for the purpose of handling and turning with aderrick. The slots f f are for the purpose of adjusting steel cutters d,to be used in roughing off any stone where they may be used toadvantage. The inner frames, g g', are also for the more convenientadjustment of the stone, into which the stone U are fixed, as shown byFig. 10, the whole then being fixed in the grinder-box by set-screws hh. This admits of the raising or lowering of the frames g g in thegrinderboxes, so'the face ofthe stone can be brought on a level with thestone in the other grinder Figs. 6, 7, and 9 represent a top, bottom,and sectional view of a scroll-grinder made of iron, the scroll beingchilled for durability. This grinder may be adjusted to the bot-toni ofthe grinder-shaft D, the salue as the grinderboxes are. The sand, beingfed through the shaft, fallsupon the stone in the carriage beneath. Thehollow con`e in the center prevents and the scroll scour and grind offthe surface of the stone beneaih.

The carriage I is filled with stone, which are secured by suitableclamps, and is driven back and forth by machinery, hereinbeforedescribed, the rotating grinders grinding the upper surface of the,stone to a perfect level. The sides of the carriage are extended down,so as to protect the wheels and the machinery beneath. The track is madeV shape, to prevent the lodgment of matter falling from above. Thewheels are grooved to correspond to the track. The chains X X, attachedto the selfadjusting frame, are for the purpose of raising said framewith the grinders. They pass up over the pulleys, under the barsK K,through the shaftY. (Shown in Fig. 3.) At one end of said shaft suitablegears are arranged in connection with the shaft and ratchet-wheel W, sothat a single person can raise the entire weight at will. The chains M,passing through the pulleys 7c 7c', with their weights m m attached, arefor the purpose of relieving the! grinders of any superiiuous weight notnecessary for economical grinding. The crankshaft is nota necessaryadjunct for a working machine.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The arrangements of the grinder-blocks U U so as to leave a hollowspace in the center, and the conveyance of sand and water to the hollowspace left by this arrangement of the stone in the grinder-boxes bymeans of the upright hollow shafts D D and their hoppers M M, or theirequivalent.

2. The collars O O or their equivalent.

3. The slots in the shafts D D, with the setscrews in the gears C C, ortheir equivalent, when combined with the shafts D D, gears C C,

self-adjusting frame L, rotary grinder-boxes N y N, and reciprocatingcarriage I.

4. The sectional grinder-boxes N N, the

inner frames, g g', the knobs d d', and the set-l screw-c, or itsequivalent, arranged and operating substantially as and for the purposedescribed.

5. The cutters e e', combined with the rotary grinder-boxes N N and thecarriage I, ar-

ranged and operating substantially as and for the purpose specified.

6. The self-adjusting frame L, the shafting R R, the gears S S and T T,racks l? I), and the slide-bearings b b', arranged and operatingsubstantially as and for the purpose described.

7. The hoisting-chains `X X, pulleys, shaft Y, ratchet-wheel W,intermediate gears, p p', and pawl r', arranged and operatingsubstantially as described, when combined `with the grinder-boxes N N,self -adjusting frame L, collars O O, and shafts D D.

8. Thechains z i', pulleys 7c lc', and weights m m, used for thepurposes described, when combined with the selfadjusting frame L,grinder-boxes N N, collars O lO, and shafts D D.

9. The scroll-grinder, with its hollow cone in the center, asrepresented inFigs. 6, 7, and 9, made and operating substantially asdescribed. 1

. FRANCIS L. KING. Vitnesses HENRY GHAPIN, RUssEL R. lVIcINTYRE.

